<template lang="html">
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item" track-by="$index"></span>
  </div>
</template>

<script>
const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';
export default {
  name: 'star',
  props: {
    size: {
      type: Number
    },
    score: {
      type: Number
    }
  },
  computed: {
    starType() {
      return 'star-' + this.size;
    },
    itemClasses() {
      let result = [];
      let score = Math.floor(this.score * 2) / 2;
      let hasDecimal = score % 1 !== 0;
      let integer = Math.floor(score);
      for(let i = 0; i < integer; i++) {
        result.push(CLS_ON);
      }
      if(hasDecimal) {
        result.push(CLS_HALF);
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF);
      }
      return result;
    }
  }
};
</script>

<style lang="scss">
  @import "../../common/scss/default";
  @import "../../common/scss/mixin";
  .star {
    font-size: 0;
    .star-item {
      display: inline-block;
      background-repeat: no-repeat;
    }
    &.star-48 {
      .star-item {
        width: 20px;
        height: 20px;
        margin-right: 22px;
        background-size: 20px 20px;
        &:last-child {
          margin-right: 0;
        }
        &.on {
          @include bg-image('./images/star48_on');
        }
        &.half {
          @include bg-image('./images/star48_half');
        }
        &.off {
          @include bg-image('./images/star48_off');
        }
      }
    }
    &.star-36 {
      .star-item {
        width: 15px;
        height: 15px;
        margin-right: 6px;
        background-size: 15px 15px;
        &:last-child {
          margin-right: 0;
        }
        &.on {
          @include bg-image('./images/star36_on');
        }
        &.half {
          @include bg-image('./images/star36_half');
        }
        &.off {
          @include bg-image('./images/star36_off');
        }
      }
    }
    &.star-24 {
      .star-item {
        width: 10px;
        height: 10px;
        margin-right: 3px;
        background-size: 10px 10px;
        &:last-child {
          margin-right: 0;
        }
        &.on {
          @include bg-image('./images/star24_on');
        }
        &.half {
          @include bg-image('./images/star24_half');
        }
        &.off {
          @include bg-image('./images/star24_off');
        }
      }
    }
  }
</style>
